About image 

Sh2-188 is a planetary nebula in the constellation Cassiopeia.
Although included in the Sharpless Catalog, it is actually a planetary nebula, located 711 light-years away from the Solar System.
It appears as a well-marked envelope on one side and very dispersed on the other, where it appears to have already dissolved.
Through its speed of expansion an age of about 7500 years has been determined. Although its appearance resembles a supernova remnant, this possibility has been ruled out due to the nature of its emissions. 

(info from Wikipedia)

Technical data
Optic          GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount        10Micron GM2000 HPSII
Camera         Moravian G3-16200 with external filter wheel 7 positions
Filters         Astrodon 50mm RGB filters and narrowband Ha 5nm/OIII 5nm
Guiding system    OAG Moravian M68 with guide camera Moravian G1-0301
Exposure details  Ha 24x900" bin2 -25C

                OIII 17x900" bin2 -25C

          RGB 6x600" bin2 -25 for each filter
Total integration  13h15'
Acquisition      Voyager, PHD2
Processing      Pixinsight 1.8, Photoshop CS5, StarXTerminator, NoiseXTerminator, BlurXTerminator
SQM-L       21.01    
Location       Promiod (Aosta Valley, Italy), own remote observatory
Date           14/16 October, 6/7 November 2021


© Roberto Marinoni 2019 - All rights reserved